Scrub brush



FIG. 1 is a perspective view of a scrub brush in accordance with the present invention;

FIG. 2 is a reduced side view of the scrub brush, the opposite side view being a mirror image thereof; and,

FIG. 3 is a reduced top view thereof, the bottom being unadorned.

The broken lines represent brush fibers, which do not form part of the claimed design. 

The ornamental design for a scrub brush, as shown. 